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Wisconsin · county maple atlas

Maple sugaring in St. Croix County, Wisconsin

St. Croix County had 13 maple operations and 1,780 taps in the 2022 Census. Around Hudson, sap usually runs from March 12 to April 5. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 157 days until the usual start.
Sap starts
Mar 12
typical year
Season ends
Apr 5
about 3 weeks
Sap days / season
33.1
1991–2026 average
Taps, 2022
1,780
#38 of 60 in WI

Sap-flow outlook at Hudson right now

Full Wisconsin forecast →

Forecast for Hudson, WI

Updated Oct 6, 6:44 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. St. Croix County's season usually opens around March 12, which is 157 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    51° / 71°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    47° / 66°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    46° / 69°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    55° / 78°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    61° / 74°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    54° / 60°
    No refreeze forecast

Data: National Weather Service. Verdicts use freeze-thaw thresholds from maple field research; your woods may run a little differently.

When the sap runs

The sugaring calendar at Hudson

Freeze-thaw weather at Hudson peaks in the weeks of Mar 2 to Apr 6, which hold about 49% of a season's sap days. March is the busiest month.
Typical season: Mar 12 – Apr 50246Week of Dec 1: 1.4 sap days on averageWeek of Dec 8: 1.6 sap days on averageWeek of Dec 15: 1.2 sap days on averageWeek of Dec 22: 0.9 sap days on averageWeek of Dec 29: 0.6 sap days on averageWeek of Jan 5: 0.7 sap days on averageWeek of Jan 12: 0.7 sap days on averageWeek of Jan 19: 0.4 sap days on averageWeek of Jan 26: 1.0 sap days on averageWeek of Feb 2: 1.1 sap days on averageWeek of Feb 9: 1.3 sap days on averageWeek of Feb 16: 1.6 sap days on averageWeek of Feb 23: 1.8 sap days on averageWeek of Mar 2: 2.3 sap days on averageWeek of Mar 9: 2.5 sap days on averageWeek of Mar 16: 3.5 sap days on averageWeek of Mar 23: 3.3 sap days on averageWeek of Mar 30: 2.6 sap days on averageWeek of Apr 6: 2.2 sap days on averageWeek of Apr 13: 1.3 sap days on averageWeek of Apr 20: 0.8 sap days on averageWeek of Apr 27: 0.3 sap days on averageWeek of May 4: 0.1 sap days on averageWeek of May 11: 0.0 sap days on averageWeek of May 18: 0.0 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 12
Average number of freeze-thaw sap days in each week of the season at Hudson, 1991–2026. A sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. The shaded band is the typical season.

Year-to-year spread

Opening signal
Median Mar 9; the middle half of seasons fell between Feb 27 and Mar 16. Earliest Feb 13 (2012), latest Mar 30 (2013).
Closing signal
Median Apr 8; middle half between Mar 31 and Apr 16. Earliest Mar 11 (2012), latest Apr 25 (1996).
Sap days by month
Dec16%Jan9%Feb17%Mar38%Apr19%May1%

36 seasons of sap weather

St. Croix County seasons, 1991–2026

The best sap year at Hudson was 2024 with 49 freeze-thaw days; the leanest was 2001 with 18. Seasons that start early tend to end early too: the trees run on the swing between freezing nights and mild days, and heat ends it.
JanFebMarAprMaysap days20262026: Feb 24 – Mar 29, 42 sap days4220252025: Feb 28 – Apr 4, 40 sap days4020242024: Feb 25 – Mar 31, 49 sap days4920232023: Mar 11 – Apr 8, 32 sap days3220222022: Mar 19 – Apr 20, 38 sap days3820212021: Feb 27 – Apr 2, 40 sap days4020202020: Mar 8 – Apr 12, 37 sap days3720192019: Mar 15 – Apr 16, 35 sap days3520182018: Mar 27 – Apr 21, 44 sap days4420172017: Feb 26 – Mar 28, 30 sap days3020162016: Feb 22 – Mar 29, 33 sap days3320152015: Mar 1 – Apr 4, 22 sap days2220142014: Mar 18 – Apr 19, 26 sap days2620132013: Mar 30 – Apr 25, 28 sap days2820122012: Feb 13 – Mar 11, 34 sap days3420112011: Mar 10 – Apr 6, 21 sap days2120102010: Feb 27 – Mar 29, 20 sap days2020092009: Mar 10 – Apr 10, 32 sap days3220082008: Mar 19 – Apr 16, 27 sap days2720072007: Feb 25 – Mar 21, 39 sap days3920062006: Mar 6 – Apr 9, 35 sap days3520052005: Mar 1 – Apr 3, 36 sap days3620042004: Mar 3 – Apr 6, 34 sap days3420032003: Mar 26 – Apr 8, 29 sap days2920022002: Mar 11 – Apr 7, 45 sap days4520012001: Mar 16 – Apr 18, 18 sap days1820002000: Feb 20 – Mar 21, 39 sap days3919991999: Mar 2 – Mar 27, 36 sap days3619981998: Feb 27 – Mar 25, 21 sap days2119971997: Mar 16 – Apr 18, 29 sap days2919961996: Mar 21 – Apr 25, 38 sap days3819951995: Mar 9 – Apr 11, 30 sap days3019941994: Mar 11 – Apr 11, 32 sap days3219931993: Mar 19 – Apr 21, 29 sap days2919921992: Mar 15 – Apr 14, 31 sap days3119911991: Mar 1 – Apr 1, 41 sap days41
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Hudson. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

St. Croix County in the Census of Agriculture

USDA counts maple operations every five years. In St. Croix County the 2022 Census found 13 farms making syrup (0% since 2017), with taps -18% and syrup output -22% over the same five years. That works out to about 0.26 gallons of syrup per tap in 2022 (0.27 in 2017). Among the 385 counties in this atlas, St. Croix County ranks 256 by taps.

St. Croix County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
2022131,7804550.26
2017132,1705860.27

Nearby

Neighboring maple counties

Distances are between reference towns; typical dates are each county's own estimate.

About these numbers

The season dates are estimated from 36 seasons of daily high and low temperatures for the PRISM 4-km grid cell at Hudson (748ft), scored with the same freeze-thaw rule as our live forecast: a sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. Each season's closing signal is the last sap day before accumulated warmth reaches a threshold, and the opening signal sits five weeks before that, never earlier than the first real freeze-thaw week. Tested against 117 state-seasons of USDA-reported dates, the rule lands within 5.5 days of the reported close and 6.6 days of the reported opening on average, and the typical dates shown here are scaled to Wisconsin's USDA record (12 years). Production figures are copied from the Census as published. Full method, calibration tables and the downloadable dataset →

Sources · 6

  1. 1.2022 Census of Agriculture, County Level Data — Wisconsin, Table 37: Maple Syrup, 2022 and 2017 · USDA National Agricultural Statistics Service
  2. 2.PRISM daily temperature grids (AN81d, 4 km), accessed 2026-10-05 · PRISM Group, Oregon State University, https://prism.oregonstate.edu
  3. 3.Applied Climate Information System (ACIS) web services · NOAA Regional Climate Centers
  4. 4.USDA NASS maple syrup reports — approximate average season opened and closed dates, 2011–2022 · USDA National Agricultural Statistics Service (mirrored by the University of Vermont)
  5. 5.Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) · de Lima Santos et al.
  6. 6.GeoNames gazetteer (cities500), CC BY 4.0 · GeoNames

FAQ

St. Croix County sugaring questions

When should I tap maple trees in St. Croix County, Wisconsin?
In a typical year the sap starts running around March 12 near Hudson and the season winds down around April 5. Have your taps in a day or two before the first forecast string of freezing nights and 40 °F days. In the past 36 seasons the weather signal came as early as Feb 13 and as late as Mar 30.
How much maple syrup does St. Croix County produce?
The 2022 Census of Agriculture counted 13 maple operations in St. Croix County with 1,780 taps producing 455 gallons of syrup, ranking 38 of 60 Wisconsin's counties with published tap counts.
How many sap days does St. Croix County get in a season?
On average 33.1 freeze-thaw sap days from December through May at Hudson, of which about 11.2 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2024 (49 sap days); the leanest was 2001 (18).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Hudson (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Wisconsin. They describe a typical year at one point in the county; your sugarbush, slope and elevation can shift them by days.

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